List of contributors: Andreas Heger, Tildon Grant Belgard, Florian Finkernagel, Leo Goodstadt, Martin Goodson all contributed code to pysam. Kevin B. Jacobs implemented a Cython wrapper for the VCF/BCF reader/writer in htslib. Gerton Lunter provided a validating VCF parser. Marcel Martin implemented python 3 compatibility. Ben Schiller contributed a Windows compatible clone. The sources in the directory samtools are from the samtools project: http://samtools.sourceforge.net/. All of these are available under the MIT licence. The attributions for this code are as follows: Heng Li from the Sanger Institute wrote most of the initial source code of SAMtools and various converters. Bob Handsaker from the Broad Institute is a major contributor to the SAM/BAM specification. He designed and implemented the BGZF format, the underlying indexable compression format for the BAM format. BGZF does not support arithmetic between file offsets. Jue Ruan for the Beijing Genome Institute designed and implemented the RAZF format, an alternative indexable compression format. RAZF supports arithmetic between file offsets, at the cost of increased index file size and the full compatibility with gzip. RAZF is optional and only used in `faidx' for indexing RAZF compressed fasta files. Colin Hercus updated novo2sam.pl to support gapped alignment by novoalign.